Color Image Encryption Based on 4D Hyperchaotic System and RSA Algorithm Combined Scrambling and Diffusion

In this paper, a color image encryption scheme based on 4D hyperchaos system and RSA algorithm is proposed. Firstly, RSA algorithm is used to generate the initial value of 4D hyperchaotic system, and the key stream is iteratively generated. Then, the color image is divided into RGB three channels. In order to change the position of image pixels, Arnold scrambling is performed on the image. Finally, simultaneous scrambling and diffusion algorithms are used to encrypt the preprocessed images for a second time. Experimental results show that the encryption scheme proposed in this paper is effective. Compared with the existing algorithms, this encryption scheme improves the encryption efficiency, has strong anti-aggression and robustness.